Hydraulic transmission device



March 3, 1942. c, E. scATEs HYDRAULIC TRANSMISSION DEVICE Filed Nov. l22, 1939 2 Sheets-Sheet l March 3, 1942. c. E. scATEs HYDRAULIC TRNSMISSION DEVICE 2 Sheets-Sheet 2 Filed Nov. 22, 1939 Patented. Va, v1942 UNITED L STATES PATENT OFFICE 2 claims.

This invention relates to an hydraulic device having a multi-speed transmission in connection with a braking device.

It is aimed to provide a novel construction which will be reversible, rotary, in which many transmission speeds may be realized and which has a valve operable automatically when the parts normally constituting a motor, function as a pump.

The more specific objects and advantages will become apparentfrom a consideration of the description following taken in connection with accompanying drawings illustrating an operative embodiment.

In said drawings:

Fig. 1 is a view in elevation showing my improved mechanism, the View being partly broken away and in section to disclose details;

Figure 2 is a view similar to Figure 1 but showing the valves in a dierent position;

Figure 371s a sectional view taken on the line 3-8 of Figure 1, and

Figure 4 is a sectional view taken on the line 4-4 of Figure 1.

Referring specifically to the drawings wherein like reference characters designate like or similar parts, I designates a rotatable shaft which may be the driven shaft for the wheels of a truck or other vehicle. Rotatable with the shaft I 9 and in a stationary housing or casing I I,

at the hub of one of such,wheels which is designated I2, is an internal gear wheel I3 enmeshed at its teeth I4 with the teeth i5 of a ation 29a of the pipe 29. However, the valve 3| .is operable to direct such hydraulic iluid through a transverse conduit 82 having a tube 33 communicating with the tank 22 and containing a two way rotatable valve 34, used for braking purposes and whose port is designated 35.' A pressure gauge 38 is arranged in communication'with the interior of the conduit 32 through the medium of a tube 31.

The gears I3 and I5 may be operated in the direction opposite to that for which valve 21 is `manually set sim-ply by turning both valves 21 and 3|, in Figure 1, 90 counterclockwise.

A transmission is built into the apparatus and in this connection three, three way valves 38, 39 and 48 are rotatably mounted ,in chambers 4|, 42 and 43, such valves having theusual T-shaped ports therethrough at 44, 45 and 48, respectively. Itis to be borne inymind that all of the valves 21, 3|, 38, 39 and 49 are manually operable from the exterior of the structure and are all arranged within the drivers or operators compartment on the vehicle, in which compartment the 'gauge is also visible.

Said casings or chambers 4|, 42 and 43 are part of an integral casting 41 which also includes gear I6 located within the housing Hand jourl naled on a shaft I1 mounted by such-housing.

.Said gears I3 and I8 in combination-with the housing II constitute a motor.

Communicating with the housing II is a con duit I8 communicating with a continuation thereof at |8a which in turn is in communication through a port I9, valve chamber 20, and suction pipe or tube 2|, with the interior of a tank or reservoir 22, adapted to contain the hydraulic fluid up to the level indicated at 23. When the hydraulic fluid is drawn into the motor, the suction unseats a valve 24 in the chamber 20 which is normally in closing relation to the upper end o f the tube 2| through the expansion of a spring 25, positioned by means of a removable closure 26. A three way valve 21 is rotatably mounted in the conduit I8a, the same having the usual T-shaped port 28 therethrough. The hydraulic iluid is adapted to pass through a conduit 29 and through the T-shaped port 30 of a rotatable valve 3|, mounted in a continuthe conduits |8a, 29a, 32, 33 and a cross conduit 48 which connects the conduits I8a and 29a.. Said chambers 4 I 42 and 43, have outlet ports therein as at 49, 50 and 5I.

A rotatable shaft 52, is journaled in the wall of the tank 22 and drives pumps 53, 54 and 55 simultaneously, such shaft 52 being driven from any suitable engine or the like. The inlet pipes of said pumps at 56, 51 and 58, respectively, communicate with the hydraulic fluid inthe tank 22 and the outlets of such pumps as at 59, GIIV and 6|, communicate with the interior of th'e casings 4I 42 and 43. Pump 53 is the smallest. Pump 54 is the next in size and has a capacity twice that of the pump 53 while pump 55 is the largest in size and has a capacity twice that of the pump 54.

With the valves set as in Figure 1, pump 53 delivers fluid through valve port 44 of valve 38 into conduits 48 and I8a, through port 28V and V conduit I8 into the motor and then back through under such conditions as a gear pump instead of a motor and draw duid up through pipe 2i past ball valve 28, through port i9, into conduit 18a,

f einem port E8, conduit i8 into gears I3 and I6 and 'cut-olf as in Figure 2, and the road is a hill, the vehicle will come to a stop because no power is being appliedu since ball valve 24 rests on its connect one of the conduits leading to the motor to one of the side conduit sections while the other conduit leading to the motor is connected to the first transverse conduit'section or to conneet the other conduit leading to the motor to the other side conduit while connecting the firstmentioned conduit leading to the motor to the iirst transverse conduit section, and a conduit l means leading from the rst. transverse section seat, refusing to let the uid back, thereby locirn ing or blocmng the vehicle from rolling bacir down the hill.

in combination with their valves, provide not only for the low speed, for which the parts are arranged, as in Figure 1, but also for a multiplicity of speeds through the manual adjustment and variations in. the positions of the valves at, 33 and d, for instance seven dierent speeds, with the arrangement shown. Y

It is apparent that valve 3d may be any quick acting valve, and also that conduits it and Z9 may be connected to not only one wheel as shown but to a plurality of Wheels.

Various changes may be resorted to. provided they fall within the spirit and scope of the invention.

i claim as my invention:

l. Apparatus of the class described having a motor, a source of hydraulic iuid, conduit means for passage of theuid from the source to the motor and from the latter to the source, said conduit means including a casting having parallel 'side conduit sections, a first transverse conduit section and a second transverse conduit section, said transverse conduit sections communicating at opposite ends with the side conduit sections. conduits leading from the side sections to the motor, a casing integral with the casting communicating with the side and second transverse conduit sections having a valve therein, means to pump =fluid from the source into the second transverse conduit section under control of the valve, three way valves at the junction of the first to the source and including a valve operable for vbraking purposes.

2. Apparatus ofthe class described having a motor, a source of hydraulic fluid, conduit means for passage of the fluid from the source to the motor and from the latter to the source, said con duit means including a casting having parallel side conduit sections, a iirst transverse conduit section and a second transverse conduit section, said transverse conduit sections communicating at opposite ends with the side conduit sections, conduits leading from the side sections to the motor, a casing integral with the casting communicating with the side and second transverse conduit sections having a valve therein, means to pump uid from the source into the second transverse conduit section under control of the valve, three way valves at the junction of the iirst transverse conduit section and side sections to connect one of the conduits leading to the motor to one of the side conduit sections while the other conduit leading to the motor is connected to the iirst transverse conduit section or to con nect the other conduit leading to the motor to the other side conduit while connecting the rstv mentioned conduit leading to the motor` to the rst transverse` conduit section, a conduit means leading from the iirst transverse section to theI 

